公开(公告)号：US12006560B2

公开(公告)日：2024-06-11

申请号：US18174649

申请日：2023-02-27

Applicant: JFE STEEL CORPORATION

Inventor： Naoki Yamamoto ,  Takuya Takashita ,  Makoto Nakaseko ,  Akio Kobayashi ,  Akiri Urata ,  Miho Chiba

IPC: H01F1/22 ,  B22F1/00 ,  B22F1/052 ,  B22F1/07 ,  B22F1/08 ,  B22F9/00 ,  C22C38/02 ,  C22C45/02 ,  H01F1/153 ,  H01F3/08 ,  H01F27/255

CPC classification number: C22C38/02 ,  B22F1/052 ,  B22F1/07 ,  B22F1/08 ,  B22F9/002 ,  C22C45/02 ,  H01F1/15308 ,  H01F1/15333 ,  H01F1/22 ,  H01F3/08 ,  H01F27/255 ,  B22F2998/10 ,  C22C2200/02 ,  C22C2202/02 ,  B22F2998/10 ,  B22F9/002 ,  B22F1/08 ,  B22F1/10 ,  B22F3/02 ,  B22F2003/248

Abstract: Provided is an Fe-based nanocrystalline alloy powder. The Fe-based nanocrystalline alloy powder has a chemical composition, excluding inevitable impurities, represented by a composition formula of FeaSibBcPdCueMf, where the M in the composition formula is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, Mn, C, Al, S, O, and N, 79 at %≤a≤84.5 at %, 0 at %≤b

公开(公告)号：US12030122B2

公开(公告)日：2024-07-09

申请号：US17075693

申请日：2020-10-21

Applicant: JFE STEEL CORPORATION ,  TOKIN CORPORATION ,  National Institute of Advanced Industrial Science and Technology

Inventor： Naomichi Nakamura ,  Makoto Nakaseko ,  Takuya Takashita ,  Mineo Muraki ,  Hoshiaki Terao ,  Raita Wada ,  Akiri Urata ,  Yu Kanamori ,  Makoto Yamaki ,  Koichi Okamoto ,  Toshinori Tsuda ,  Shoichi Sato ,  Kimihiro Ozaki

IPC: B22F3/14 ,  B22F1/00 ,  B22F1/02 ,  B22F1/08 ,  B22F1/102 ,  B22F1/16 ,  B22F3/00 ,  B22F3/02 ,  B22F3/03 ,  C22C33/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/16 ,  C22C45/02 ,  H01F1/153 ,  H01F3/08 ,  H01F41/02 ,  H01F27/255

CPC classification number: B22F3/14 ,  B22F1/00 ,  B22F1/08 ,  B22F1/102 ,  B22F1/16 ,  B22F3/00 ,  B22F3/02 ,  B22F3/03 ,  C22C33/02 ,  C22C38/00 ,  C22C38/002 ,  C22C38/02 ,  C22C38/16 ,  C22C45/02 ,  H01F1/15308 ,  H01F1/15325 ,  H01F1/15333 ,  H01F1/15375 ,  H01F3/08 ,  H01F41/0246 ,  B22F2301/35 ,  B22F2304/10 ,  C22C2200/02 ,  C22C2200/04 ,  C22C2202/02 ,  H01F27/255

Abstract: Provided is a method of manufacturing a soft magnetic dust core. The method includes: preparing coated powder including amorphous powder made of an Fe-B-Si-P-C-Cu-based alloy, an Fe-B-P-C-Cu-based alloy, an Fe-B-Si-P-Cu-based alloy, or an Fe-B-P-Cu-based alloy, with a first initial crystallization temperature Tx1 and a second initial crystallization temperature Tx2; and a coating formed on a surface of particles of the amorphous powder; applying a compacting pressure to the coated powder or a mixture of the coated powder and the amorphous powder at a temperature equal to or lower than Tx1−100 K; and heating to a maximum end-point temperature equal to or higher than Tx1−50 K and lower than Tx2 with the compacting pressure being applied.

公开(公告)号：US11814707B2

公开(公告)日：2023-11-14

申请号：US16481449

申请日：2018-01-26

Applicant: TOKIN CORPORATION ,  JFE STEEL CORPORATION

Inventor： Akiri Urata ,  Miho Chiba ,  Mineo Muraki ,  Makoto Nakaseko ,  Takuya Takashita

IPC: C22C38/00 ,  C22C33/02 ,  C22C38/02 ,  C22C38/06 ,  C22C38/14 ,  C22C38/16 ,  C22C45/02 ,  H01F1/147 ,  B22F1/08 ,  H01F1/153

CPC classification number: C22C38/005 ,  B22F1/08 ,  C22C33/0257 ,  C22C38/02 ,  C22C38/06 ,  C22C38/14 ,  C22C38/16 ,  C22C45/02 ,  H01F1/14791 ,  C22C2200/02 ,  C22C2200/04 ,  C22C2202/02 ,  H01F1/15333 ,  B22F2998/10 ,  B22F9/082 ,  B22F1/08 ,  B22F2003/248 ,  B22F1/148 ,  B22F3/02

Abstract: This soft magnetic powder is represented by composition formula FeaSibBcPdCue with the exception of unavoidable impurities. In the composition formula, a, b, c, d and e satisfy 79≤a≤84.5 at %, 0≤b

公开(公告)号：US11600414B2

公开(公告)日：2023-03-07

申请号：US17262204

申请日：2019-07-25

Applicant: JFE STEEL CORPORATION

Inventor： Naoki Yamamoto ,  Takuya Takashita ,  Makoto Nakaseko ,  Akio Kobayashi ,  Akiri Urata ,  Miho Chiba

IPC: H01F1/22 ,  C22C45/02 ,  H01F1/153 ,  B22F9/24 ,  B22F9/00 ,  H01F3/08 ,  H01F27/255 ,  B22F1/07

Abstract: Provided is a soft magnetic powder that can produce a dust core having excellent magnetic properties. The soft magnetic powder has a chemical composition, excluding inevitable impurities, represented by a composition formula of FeaSibBcPdCueMf, where the M is at least one element selected from the group consisting of Nb, Mo, Zr, Ta, W, Hf, Ti, V, Cr, Mn, C, Al, S, O, and N, 79 at %≤a≤84.5 at %, 0 at %≤b